You can use apple juice instead of citrus. This is what I used the first time I flushed using my doctor's program.
I am an true beliver in Epsom Salts , but their purpose is to clear the bowel and relax the biliary ducts. They have little to do with actually passing the stones, ES just makes the passage much easier and safer. Turmeric helps cleanse the liver and make cholesterol more liquid, apple juice or malic acid helps soften stones. You could use these for two or three weeks before flushing. There are other herbs recommended in this forum, I looked at them, but they were too expensive for my budget. I can't tell you if they work better than turmeric and apple juice or not.